A todo list is a personal tool that helps you manage your time and remain organized. It can be as basic as a simple piece of paper with the day, date, and task written on it. It can be anything from using a personal planner to write out your daily tasks on paper or using a web app like the one above.
A todo list can help you manage your time better because it forces you to focus on what needs prioritizing. For example, if you have trouble prioritizing your work, then making sure all of your tasks are accounted for might help motivate you.
The benefits of todo lists vary depending on how they are used but many people find that they increase productivity in their work-life as well as their personal life.